Synopsis from MAL
In regards to the MMORPG Cross Reverie, Sakamoto Takuma boasted an overwhelming strength that was enough for him to be called the Demon King by the other players. One day, he gets summoned to another world with his appearance in the game. There, there are two people that insist "I am the real summon master." Takuma gets slave-turning magic used for summoned beasts cast on him by the girls―

However, the peculiar ability "Magic Reflection" is invoked! The ones that were turned to slaves were the girls!

Takuma was bewildered. He's the strongest magician but, he doesn't have any social skills. Panicking, the first words that came out were the ones that he used inside the game role-playing the Demon King?! "I'm amazing you say? Of course I am. I am Diablo... The one feared as the Demon King!"

This is the story the Demon King (acting) that would soon inspire the world and his other world adventure that he plunges through with his absolute strength, raise the curtain!

@Roman false alarm. while this anime also give the MC the ability t ocontrol the girls aganst their well, it isnt based on the manga i had in mind. in that manga, the MC forced the girls to have sex with him........... this anime MC is just lame

Not terrible. There was a bit of fun to be had and even a little bit of emotion. It seems like there's some fairly hardcore ecchi in this one and that's not necessarily an awful thing. It's about as much as you could want to get from the dime a dozen isekai series.

I do hope that there are environmental repercussions for how he trashed an entire ecosystem with that ice spell. Like the wild life and monsters start to migrate away from it and attack the town, or the ice eventually melts and it causes a flood to nearby areas. Something to show that there be consequences and such for haphazardly throwing around that kind of power. It would make the world feel that much more real and connected. Kinda like how in Konosuba, an explosion spell from Megumin usually alters the world in some way that spells trouble for our squad of adventurers.

This seemed like trash when I first heard about it, but it's way better than I expected. The plot is simple enough that I don't have to take it too seriously, but it's not so simple that I would get bored. The only complaint I have is that the tan Fallen best girl doesn't get enough screentime.